Abstract
Core Ideas Brassica carinata is a new crop in the Northern Great Plains. Best management practices including N fertilizer recommendations should be developed. Seed yield and oil yield were optimized at 84 kg ha –1 of applied N fertilizer. Seed oil concentration decreased linearly at a rate of 0.26 g kg –1 for every 1 kg ha –1 increase in N rate. Economic optimum N rate varied from 60 to 81 kg N ha –1 . ABSTRACT Ethiopian mustard ( Brassica carinata A. Braun) is a non‐food oilseed crop that has received attention for its potential as a low‐input biofuel feedstock suitable for production in the semiarid regions of the Northern Great Plains (NGP). Because B. carinata is a new crop to the NGP, the best management practices have yet to be developed. The objective of the study was to evaluate the effects of N fertilizer rate on seed yield, seed oil concentration, and oil yield of B. carinata and to determine the economic optimum N fertilizer rates. Field studies were conducted at two locations in South Dakota to evaluate the response of two B. carinata varieties to five N fertilizer rates (0, 28, 56, 84, and 140 kg N ha −1 ) during the 2015 and 2016 growing seasons. Increasing N fertilizer rate increased seed yield and oil yield, each reaching a peak at 84 kg ha −1 N and then slowly decreasing following a quadratic model. On the other hand, increasing N rate linearly decreased seed oil concentration. The economic optimum N rate ranged from 60 to 81 kg N ha −1 depending on cost of N fertilizer and the price of carinata seed. These results show that the N requirement for B. carinata is lower than that for many crops grown in the NGP, including corn and small grains. These findings confirm that B. carinata requires low N fertility and has the potential for incorporation into cropping systems in the semiarid regions of the NGP.
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Claims 4
Claim · model-written summary
Increasing N fertilizer rate increased seed yield and oil yield of Brassica carinata up to a peak at 84 kg N per ha, then decreased them slowly.
- Taxon
- Brassica carinata
Brassica carinatae0 - Material
- two B. carinata varietiese1
- Treatment
- N fertilizer ratee2
- Outcome
- seed yield and oil yielde2
- Direction
- increasede2
- Qualifier
- peak at 84 kg ha −1 Ne2
- Setting
- South Dakotae1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethiopian mustard ( Brassica carinata A. Braun)”
e1“Field studies were conducted at two locations in South Dakota to evaluate the response of two B. carinata varieties to five N fertilizer rates”
e2“Increasing N fertilizer rate increased seed yield and oil yield, each reaching a peak at 84 kg ha −1 N and then slowly decreasing following a quadratic model”
Claim · model-written summary
Increasing N rate linearly decreased seed oil concentration of Brassica carinata, by 0.26 g per kg per kg N ha.
- Taxon
- Brassica carinataBrassica carinatae0
- Treatment
- N ratee3
- Outcome
- seed oil concentratione3
- Direction
- linearly decreasede3
- Value
- 0.26 g kg –1e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethiopian mustard ( Brassica carinata A. Braun)”
e3“increasing N rate linearly decreased seed oil concentration”
e4“Seed oil concentration decreased linearly at a rate of 0.26 g kg –1 for every 1 kg ha –1 increase in N rate”
Claim · model-written summary
The economic optimum N rate of Brassica carinata ranged from 60 to 81 kg N per ha, depending on N fertilizer cost and seed price.
- Taxon
- Brassica carinataBrassica carinatae0
- Outcome
- economic optimum N ratee5
- Value
- 60 to 81 kg N ha −1e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethiopian mustard ( Brassica carinata A. Braun)”
e5“The economic optimum N rate ranged from 60 to 81 kg N ha −1 depending on cost of N fertilizer”
Claim · model-written summary
The N requirement of Brassica carinata is lower than that of many crops grown in the Northern Great Plains, including corn and small grains.
- Taxon
- B. carinataBrassica carinatae6
- Outcome
- N requiremente6
- Direction
- lowere6
- Comparator
- corn and small grainse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“the N requirement for B. carinata is lower than that for many crops grown in the NGP, including corn and small grains”
The same questions in other papers
fertilization · quality: oil · Brassica carinata (Ethiopian mustard)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- positive
nitrogen · quality: oil · Brassica carinata (Ethiopian mustard)Positive and negative results
1 paper in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.